I am a new mom with an almost six month old. She loves to sleep about 12hrs around 9-9 with one or two feedings in the middle of the night. During the day, she gets to crawl, creep, roll, and or jump around. We get her out of house--well my husband or grandma (whomever is watching her). She is going longer between feedings and when she does she nurses about 7-15 minutes. I think it depends what my milk is like--sometimes with more foremilk she will nurse until she gets the good stuff. I am thinking: is your son in the middle or top of his age group according to well-baby check-ups? My little one is 95% in her height and weight...she is top 5%...so I don't know if that makes a difference. Also, I am not a big routine person but when it comes to food and sleep I try to make those predictable so she has a natural pattern:
Sleeps between 9-9:30, nurses around 2AM
Nurses at 6:30AM
Wakes at 9-9:30AM
Plays until 11:15or so
Naps 11:30-12 or 12:30
Bottle 12 or 12:30
Naps 1:30
Nurses 2:30
Naps 3-4PM
Jump/C;reep/Tummy time 4-4:30
Naps 5:30-6PM
More jump, crawl, tummy fun time 6-7PM
Nap 7-7:30
Nurse and then solids 7:30-7:45PM
Play, talk, etc 7:45PM-8:45PM
Bedtime routine: always: pajamas, read and sing, nurse or pacifier (bath ever other night)
Hope that helps. :)